Digital Flight Data Recorder (DFDR) and Cockpit Voice Recorder (CVR) of crashed Ethiopian Airlines 737MAX8 Flight ET302, were recovered from the wreckage on Monday, Ethiopian Airlines said in a statement.
The flight data recorder (FDR) records different operating conditions of the flight. FDR in Boeing 737MAX monitor at least eighty-eight important parameters such as time, altitude, airspeed, heading, and aircraft attitude.
The CVR records the flight crew’s voices, and other sounds such as engine noise, stall warnings, landing gear extension and retraction, and other clicks and pops. It also records communications with Air Traffic Control, automated radio weather briefings, and conversation between the pilots and ground or cabin crew.
From CVR and FDR data, Investigators can generate a computer animated video reconstruction of the flight. The investigator can then visualize the airplane’s attitude, instrument readings, power settings and other characteristics of the flight. This animation enables the investigating team to visualize the last moments of the flight before the accident.
It records at least last 25 hours of information.